/Engine/Source/Editor/BlueprintGraph/Public/BlueprintActionFilter.h
NOTE: Appending additional filters can hinder performance (as the additional filter has to loop over its tests foreach database entry)
This.
[FBlueprintActionFilter](API\Editor\BlueprintGraph\FBlueprintActionFilter) const & operator&= ( [FBlueprintActionFilter](API\Editor\BlueprintGraph\FBlueprintActionFilter) const & Rhs )